Systems and method are specified to improve the reception of UL transmission, for example in power or coverage limited situations. A WTRU may modify procedures to increase the available signal energy for reception at an eNB and/or to make more efficient use of the available signal energy at the receiver for processing UL transmissions. Example methods for increasing UL link coverage may include modifying HARQ timing (e.g., shorter HARQ), using longer TTIs, use of dedicated PUSCH allocations, use of new PUSCH modulations, enhanced reference signal design, UL macro diversity reception for PUSCH, utilizing protocol reduction techniques, ensuring in-order packet delivery, and/or utilizing a configuration for coverage limited/power limited modes of operation. The proposed methods may be applied individually or in any combination.
Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
2. The WTRU of claim 1, wherein the grant indicates the length of the uplink transmission.
A wireless transmit/receive unit (WTRU) is configured to receive a grant from a network node, where the grant includes information indicating the length of an uplink transmission. The WTRU processes this grant to determine the duration of the uplink transmission it is permitted to perform. The grant may be received over a control channel, such as a physical downlink control channel (PDCCH), and includes scheduling information that specifies the transmission length. The WTRU then transmits uplink data or control information according to the indicated length, ensuring proper synchronization and resource allocation with the network. This mechanism allows dynamic adjustment of uplink transmission durations based on network conditions, improving efficiency and reducing interference. The WTRU may also adjust its transmission parameters, such as modulation and coding schemes, based on the grant to optimize performance. The network node, such as a base station, determines the appropriate transmission length based on factors like channel conditions, traffic load, and quality of service requirements. This system enhances uplink communication reliability and resource utilization in wireless networks.
3. The WTRU of claim 2, wherein the length of the uplink transmission corresponds to a size of a transmission time interval bundle.
A wireless transmit/receive unit (WTRU) is configured to manage uplink transmissions in a wireless communication system, particularly in scenarios where the WTRU operates in a discontinuous reception (DRX) mode. The WTRU includes a processor and a transceiver, where the processor is designed to determine a length for an uplink transmission based on a transmission time interval (TTI) bundle size. The transceiver then transmits data over the uplink channel according to this determined length. The TTI bundle size defines the duration or structure of the transmission, ensuring efficient resource allocation and synchronization in the network. This approach optimizes power consumption and reduces signaling overhead by aligning the uplink transmission duration with the predefined TTI bundle, which is particularly useful in DRX cycles where the WTRU periodically wakes up to transmit or receive data. The system may also include mechanisms to adjust the TTI bundle size dynamically based on network conditions or traffic demands, enhancing flexibility and performance. The WTRU may further coordinate with a base station to ensure proper scheduling and resource allocation for the uplink transmission. This method improves efficiency in wireless communication systems by minimizing unnecessary transmissions and ensuring timely data delivery.
4. The WTRU of claim 1, wherein the uplink transmission corresponds to a physical uplink shared channel transmission, and one or more OFDM symbols that are not used for transmitting the one or more demodulation reference signals are used for transmitting user data.
This invention relates to wireless communication systems, specifically improving the efficiency of uplink transmissions in wireless transmit/receive units (WTRUs). The problem addressed is the inefficient use of orthogonal frequency-division multiplexing (OFDM) symbols during uplink transmissions, particularly when demodulation reference signals (DMRS) are included. Traditional methods may leave some OFDM symbols unused, reducing data transmission capacity. The invention describes a WTRU configured to transmit uplink data via a physical uplink shared channel (PUSCH). The WTRU includes a transmitter that sends one or more DMRS symbols for channel estimation and one or more OFDM symbols carrying user data. The key improvement is that OFDM symbols not allocated to DMRS are fully utilized for transmitting user data, maximizing spectral efficiency. The WTRU may adjust the allocation of OFDM symbols dynamically based on channel conditions or transmission requirements. This approach ensures that no OFDM symbols are wasted, enhancing data throughput while maintaining reliable channel estimation. The invention is particularly useful in high-speed wireless networks where efficient resource utilization is critical.
5. The WTRU of claim 1, wherein the processor being configured to determine the one or more OFDM symbols for transmitting the one or more demodulation reference signals comprises the processor being configured to determine a number of OFDM symbols that are to be used to transmit the one or more demodulation reference signals.
This invention relates to wireless communication systems, specifically to a wireless transmit/receive unit (WTRU) configured to optimize the transmission of demodulation reference signals (DMRS) in orthogonal frequency-division multiplexing (OFDM) systems. The problem addressed is the efficient allocation of OFDM symbols for DMRS transmission to improve signal quality and reduce overhead in wireless communications. The WTRU includes a processor that determines the number of OFDM symbols required to transmit one or more DMRS. This determination is based on factors such as channel conditions, data rate requirements, and system constraints. By dynamically adjusting the number of OFDM symbols allocated for DMRS, the WTRU enhances signal demodulation accuracy while minimizing resource usage. The processor may also configure the DMRS transmission parameters, such as symbol positions and power levels, to further optimize performance. The invention improves wireless communication efficiency by dynamically allocating OFDM symbols for DMRS, ensuring reliable signal demodulation while reducing unnecessary overhead. This approach is particularly useful in high-mobility or high-interference environments where precise reference signal placement is critical. The WTRU's adaptive configuration ensures compatibility with various wireless standards and deployment scenarios.
6. The WTRU of claim 1, wherein the one or more OFDM symbols for transmitting the one or more demodulation reference signals are determined based on a frequency hopping mode of the WTRU.
This invention relates to wireless communication systems, specifically to methods for transmitting demodulation reference signals (DMRS) in a wireless transmit/receive unit (WTRU) using orthogonal frequency-division multiplexing (OFDM). The problem addressed is optimizing DMRS transmission to improve signal reliability and reduce interference in frequency-hopping scenarios. The WTRU determines the OFDM symbols used for transmitting DMRS based on a frequency hopping mode. Frequency hopping involves changing the carrier frequency during transmission to mitigate interference and improve robustness. The WTRU selects specific OFDM symbols for DMRS transmission depending on the hopping pattern, ensuring that reference signals are placed optimally within the hopped frequency bands. This approach enhances channel estimation accuracy and signal demodulation performance, particularly in dynamic wireless environments where interference varies across frequencies. The WTRU may also adjust the DMRS transmission parameters, such as symbol positions or sequence generation, in response to the hopping mode. For example, in a slow-hopping mode, DMRS may be transmitted in fixed symbol positions, while in a fast-hopping mode, the symbols may be dynamically adjusted to align with the hopping intervals. This flexibility ensures that DMRS remains effective regardless of the hopping rate or pattern. The invention improves wireless communication reliability by dynamically adapting DMRS transmission to frequency-hopping operations, reducing interference and enhancing signal quality.
7. The WTRU of claim 1, wherein the grant comprises an index, the index indicating the length of the uplink transmission.
Wireless communication systems, particularly those using orthogonal frequency-division multiple access (OFDMA), require efficient uplink transmission scheduling to manage resources and reduce latency. A key challenge is determining the length of uplink transmissions to optimize bandwidth usage and minimize delays. Existing solutions often rely on fixed or preconfigured transmission lengths, which may not adapt dynamically to varying network conditions or traffic demands. This invention addresses the problem by introducing a wireless transmit/receive unit (WTRU) configured to receive a grant for uplink transmission, where the grant includes an index. The index serves as a direct indicator of the length of the uplink transmission, allowing the WTRU to determine the transmission duration without additional signaling or computation. This approach reduces overhead and latency by eliminating the need for separate length negotiation or explicit length signaling. The WTRU processes the grant, decodes the index, and adjusts the transmission length accordingly, ensuring efficient resource allocation and timely data delivery. The system may also support multiple transmission lengths, with the index mapping to predefined values in a lookup table or a mathematical formula. This method enhances flexibility and scalability in wireless networks, particularly in scenarios with dynamic traffic patterns or varying channel conditions.
8. The WTRU of claim 7, wherein the index is indicative of a start time of the uplink transmission and the length of the uplink transmission.
A wireless transmit/receive unit (WTRU) is configured to determine an index that indicates both the start time and the duration of an uplink transmission. This index is used to schedule or coordinate the uplink transmission within a wireless communication system, such as in a cellular network. The WTRU may generate or receive this index, which allows the system to efficiently manage uplink resources by specifying when the transmission begins and how long it lasts. This helps optimize bandwidth usage and reduce interference by ensuring that transmissions are properly synchronized and do not overlap with other communications. The WTRU may also use the index to adjust its transmission timing or power based on the scheduled parameters. This approach is particularly useful in systems where multiple devices share the same uplink resources, as it enables precise control over transmission timing and duration. The index may be derived from system parameters, network commands, or predefined scheduling rules, ensuring that the uplink transmission aligns with the network's resource allocation strategy.
9. The WTRU of claim 1, wherein the one or more OFDM symbols for transmitting the one or more demodulation reference signals are determined further based on a type of the uplink transmission.
This invention relates to wireless communication systems, specifically to methods for determining the transmission of demodulation reference signals (DMRS) in orthogonal frequency-division multiplexing (OFDM) systems. The problem addressed is optimizing DMRS transmission to improve signal quality and reliability in uplink communications, particularly in scenarios with varying transmission types. The invention involves a wireless transmit/receive unit (WTRU) that transmits uplink signals using OFDM symbols. The WTRU determines the specific OFDM symbols for transmitting one or more DMRS based on the type of uplink transmission. Different transmission types, such as data, control, or hybrid transmissions, may require different DMRS configurations to ensure accurate demodulation at the receiver. By dynamically adjusting the DMRS transmission symbols according to the transmission type, the system can enhance performance, reduce interference, and improve spectral efficiency. The WTRU may also consider other factors, such as channel conditions or network requirements, when selecting the OFDM symbols for DMRS transmission. The invention ensures that the DMRS are placed optimally within the transmission frame to support reliable demodulation while minimizing overhead. This approach is particularly useful in advanced wireless systems where multiple transmission types coexist and require flexible reference signal configurations.
11. The method of claim 10, wherein the grant indicates the length of the uplink transmission.
A method for managing uplink transmissions in a wireless communication system addresses the challenge of efficiently allocating and utilizing uplink resources. The method involves a base station transmitting a grant to a user device, where the grant specifies the length of the uplink transmission. This allows the user device to determine the duration for which it can transmit data to the base station without requiring additional signaling. The grant may include parameters such as the start time, duration, and frequency resources allocated for the uplink transmission. By dynamically adjusting the transmission length based on network conditions or device requirements, the method optimizes resource utilization and reduces latency. The base station monitors the uplink transmission and may adjust subsequent grants to maintain efficient communication. This approach is particularly useful in systems where uplink resources are limited or where low-latency communication is critical, such as in 5G or IoT applications. The method ensures that the user device adheres to the specified transmission length, preventing interference and improving overall network performance.
12. The method of claim 11, wherein the length of the uplink transmission corresponds to a size of a transmission time interval bundle.
A method for wireless communication involves managing uplink transmissions in a network where devices communicate with a base station. The method addresses the challenge of efficiently allocating and scheduling uplink transmissions to optimize network performance and resource utilization. Specifically, the method includes determining a transmission time interval (TTI) bundle size for an uplink transmission, where the TTI bundle represents a group of consecutive TTIs used for transmitting data. The length of the uplink transmission is adjusted to correspond to the size of this TTI bundle, ensuring that the transmission aligns with the predefined bundle structure. This alignment helps in reducing overhead, improving synchronization, and enhancing overall transmission efficiency. The method may also involve configuring the TTI bundle size based on network conditions, device capabilities, or quality of service requirements. By dynamically adjusting the transmission length to match the TTI bundle, the method ensures efficient use of network resources while maintaining reliable communication. This approach is particularly useful in scenarios where devices operate under varying channel conditions or have different data transmission needs.
13. The method of claim 10, wherein the uplink transmission corresponds to a physical uplink shared channel transmission, and one or more OFDM symbols that are not used for transmitting the one or more demodulation reference signals are used for transmitting user data.
This invention relates to wireless communication systems, specifically improving the efficiency of uplink transmissions in scenarios where demodulation reference signals (DMRS) are used. The problem addressed is the underutilization of orthogonal frequency-division multiplexing (OFDM) symbols during uplink transmissions, particularly when DMRS symbols are present. Traditional approaches may leave some OFDM symbols unused, reducing data transmission efficiency. The invention describes a method for optimizing uplink transmissions, particularly for physical uplink shared channel (PUSCH) transmissions. In this method, one or more OFDM symbols that are not allocated for transmitting DMRS are repurposed to carry user data instead of remaining idle. This ensures that available transmission resources are fully utilized, enhancing data throughput and spectral efficiency. The approach is applicable in wireless communication systems where DMRS symbols are required for channel estimation and demodulation, such as in 5G New Radio (NR) or other OFDM-based systems. By dynamically allocating unused OFDM symbols to user data, the method improves overall system performance without requiring additional hardware or significant modifications to existing protocols. The solution is particularly beneficial in high-data-rate scenarios where efficient resource utilization is critical.
14. The method of claim 10, wherein determining the one or more OFDM symbols for transmitting the one or more demodulation reference signals comprises determining a number of OFDM symbols that are to be used to transmit the one or more demodulation reference signals.
This invention relates to wireless communication systems, specifically to methods for transmitting demodulation reference signals (DMRS) in orthogonal frequency-division multiplexing (OFDM) systems. The problem addressed is efficiently determining the number of OFDM symbols required to transmit DMRS in a way that optimizes signal quality and resource allocation. The method involves selecting one or more OFDM symbols for transmitting DMRS by determining the number of symbols needed based on system requirements, such as channel conditions, data rate, or interference levels. The selection ensures that the DMRS can be accurately received and demodulated by the receiver, improving signal reliability. The process may involve analyzing channel state information, signal-to-noise ratio, or other performance metrics to decide the optimal number of symbols. This approach allows for dynamic adjustment of DMRS transmission, balancing overhead and performance in wireless communication systems. The method is particularly useful in 5G and beyond-5G networks where efficient resource utilization is critical.
15. The method of claim 10, wherein the one or more OFDM symbols for transmitting the one or more demodulation reference signals are determined based on a frequency hopping mode of the WTRU.
This invention relates to wireless communication systems, specifically to methods for transmitting demodulation reference signals (DMRS) in orthogonal frequency-division multiplexing (OFDM) systems. The problem addressed is optimizing DMRS transmission to improve signal reliability and reduce interference in wireless transmissions, particularly in scenarios where frequency hopping is used to mitigate channel fading and interference. The method involves determining the specific OFDM symbols used for transmitting DMRS based on the frequency hopping mode of the wireless transmit/receive unit (WTRU). Frequency hopping is a technique where the transmission frequency changes over time to avoid prolonged exposure to fading or interference. The invention ensures that DMRS are transmitted in OFDM symbols that align with the WTRU's hopping pattern, maintaining signal integrity during frequency transitions. This approach enhances demodulation accuracy by ensuring reference signals are available at critical points in the hopping sequence, improving overall communication performance in dynamic wireless environments. The method may also include selecting specific OFDM symbols based on predefined rules or configurations to optimize DMRS placement relative to the hopping pattern. The invention is particularly useful in systems where frequency hopping is employed to enhance robustness against interference and fading, such as in cellular networks or IoT applications.
16. The method of claim 10, wherein the grant comprises an index, the index indicating the length of the uplink transmission.
In wireless communication systems, efficient uplink transmission scheduling is critical for optimizing network performance and resource utilization. A method addresses the challenge of dynamically allocating uplink transmission opportunities while minimizing signaling overhead and latency. The method involves a base station transmitting a grant to a user device, where the grant includes an index that specifies the length of the uplink transmission. This index allows the user device to determine the duration of the transmission without requiring additional signaling, reducing overhead and improving efficiency. The grant may also include other parameters, such as timing information or resource allocation details, to further streamline the transmission process. By embedding the transmission length in the grant via an index, the method ensures rapid and precise uplink scheduling, enhancing overall system throughput and reliability. This approach is particularly useful in high-traffic scenarios where minimizing signaling delays is essential for maintaining low-latency communication. The method can be applied in various wireless standards, including 5G and beyond, to improve uplink transmission efficiency.
17. The method of claim 16, wherein the index is indicative of a start time of the uplink transmission and the length of the uplink transmission.
This invention relates to wireless communication systems, specifically to methods for managing uplink transmissions in a network. The problem addressed is the need for efficient scheduling and coordination of uplink transmissions between user devices and a base station to avoid collisions and optimize resource usage. The method involves generating an index that provides timing information for uplink transmissions. This index includes a start time for the uplink transmission and the duration or length of the transmission. The index is used to coordinate the timing of transmissions from multiple devices, ensuring that they do not overlap in a way that would cause interference or data loss. The method may also involve transmitting this index to the devices, allowing them to synchronize their uplink transmissions accordingly. Additionally, the method may include determining the start time and length of the uplink transmission based on factors such as network load, device priority, or quality of service requirements. The index can be dynamically updated to adapt to changing network conditions, ensuring efficient use of available resources. This approach helps improve the reliability and efficiency of uplink communications in wireless networks.
18. The method of claim 10, wherein the one or more OFDM symbols for transmitting the one or more demodulation reference signals are determined further based on a type of the uplink transmission.
This invention relates to wireless communication systems, specifically to methods for determining the transmission of demodulation reference signals (DMRS) in orthogonal frequency-division multiplexing (OFDM) systems. The problem addressed is the efficient and adaptive allocation of OFDM symbols for DMRS transmission to support different types of uplink transmissions, such as data, control, or hybrid signals, while optimizing spectral efficiency and reliability. The method involves selecting one or more OFDM symbols for transmitting DMRS based on the type of uplink transmission. The selection process considers the specific requirements of the transmission type, such as the need for higher reference signal density for control channels or lower overhead for data channels. The DMRS symbols are chosen to ensure accurate channel estimation and demodulation at the receiver while minimizing unnecessary resource usage. The approach allows dynamic adaptation to different transmission scenarios, improving overall system performance. The method may also involve determining the DMRS symbols based on additional factors, such as channel conditions, modulation schemes, or transmission bandwidth, to further optimize the reference signal allocation. By tailoring the DMRS transmission to the uplink transmission type, the system achieves a balance between channel estimation accuracy and resource efficiency. This technique is particularly useful in advanced wireless systems like 5G and beyond, where flexible and efficient reference signal design is critical for supporting diverse communication needs.
20. The base station of claim 19, wherein the uplink transmission corresponds to a physical uplink shared channel transmission, the grant comprises an index, and the index is indicative of a start time of the uplink transmission and the length of the uplink transmission.
This invention relates to wireless communication systems, specifically to base stations that schedule uplink transmissions from user devices. The problem addressed is the need for efficient and flexible scheduling of uplink transmissions, particularly for physical uplink shared channel (PUSCH) transmissions, to optimize resource utilization and reduce latency. The base station includes a processor configured to generate and transmit a grant to a user device, where the grant contains an index. This index indicates both the start time and the duration of the uplink transmission, allowing the user device to determine when and for how long it should transmit data. By encoding both the start time and length in a single index, the system reduces signaling overhead and simplifies scheduling decisions. The base station also monitors the uplink transmission to ensure proper reception and may adjust future grants based on network conditions. This approach improves efficiency by dynamically allocating resources without requiring separate signaling for start time and duration, reducing complexity in the scheduling process. The method is particularly useful in scenarios where low-latency communication is critical, such as in 5G and beyond networks. The base station may also support additional features like retransmission handling and adaptive modulation and coding based on the uplink transmission characteristics.
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August 10, 2021
April 30, 2024
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